Method and apparatus for the modulated raising of the carriages of a wind-up roll in the centerless winding of webs

Abstract

A method and apparatus for the centerless winding of webs has a pressure cylinder which lies on a wind-up roll, both of which are mounted on vertical movement. The vertical movement of the carriage mounting the wind-up roll is modulated by coupling the vertical movement of the pressure cylinder therewith such that the carriages follow the movement of the pressure cylinder to a degree corresponding to the momentary degree to which the wind-up roll has been wound.

What is claimed is: 
     
       1. In a method for the centerless winding of webs of the type wherein a pressure cylinder lies on a wind-up roll having stub shafts inserted in its core and mounted on movable carriages and the vertical displacement of the carriage is modulated, the improvement wherein the modulation of the movement of the carriages comprises coupling the vertical movement of the carriages with the upward movement of the pressure cylinder such that the carriages follow that movement to a degree corresponding to the momentary degree to which the wind-up roll has been wound. 
     
     
       2. An apparatus for the centerless winding of webs comprising: a rotatably driven wind-up roll; means mounting the wind-up roll for vertical displacement of the axis thereof; a pressure cylinder disposed axially parallel to the wind-up roll; and means for modulating the vertical displacement of the wind-up roll comprising means mounting the pressure cylinder for vertical displacement of the axis thereof and means coupling the vertical movement of the wind-up roll to the vertical movement of the pressure cylinder such that the movement of the wind-up roll follows that movement to a degree corresponding to the momentary degree to which the wind-up roll has been wound. 
     
     
       3. Apparatus according to claim 2, wherein the means mounting the pressure cylinder comprises a pulley and first cables connected at one end to the pressure cylinder and over the pulley, the means mounting the wind-up roll comprises a core tube of the roll, stub shafts inserted therein, carriages connected to the stub-shafts, second cables connected to the carriages and a cam over which the second cables are connected, wherein the coupling means comprises means connecting the pulley and cam and means maintaining at least the first cables in the continuously tensed state. 
     
     
       4. Apparatus according to claim 3, wherein the coupling means comprises separate power sources for keeping the first and second cables constantly in the tensed state. 
     
     
       5. Apparatus according to claim 3 or claim 4, wherein the coupling means comprises a clutch connecting the cam to the pulley.